recognize citeseerx URLs

[GlazerMann]

OA points to them often

[codecov]

Codecov Report

Merging #526 into master will decrease coverage by 2.86%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #526      +/-   ##
============================================
- Coverage     75.67%   72.81%   -2.87%     
- Complexity     1444     1450       +6     
============================================
  Files             9        9              
  Lines          2471     2483      +12     
============================================
- Hits           1870     1808      -62     
- Misses          601      675      +74

Impacted Files	Coverage Δ	Complexity Δ
Template.php	79.74% <83.33%> (-4.03%)	1298 <0> (+6)
expandFns.php	95.16% <0%> (+0.11%)	0% <0%> (ø)	⬇️

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